A Google project headed by Vic Gundotra and Bradley Horowitz, Google+ is designed to be the social extension of Google. Its features focus on making online sharing easy for users. Circles, think social circles, akin to Facebook's lists. Sandbar, a user-unifying toolbar. Sparks, a search engine for sharing content between users. Messenger, a group messaging app that allows users to share with certain Circles. Hangouts, group video chatting designed to allow up to 10 users video chat at once. Each Google+ user can replace his or her standard Google profile which will stream everything that user has shared as well as the +1 content. The +1 button is similar to a Facebook like.